An accidental explosion at a gas station killed at least 25 people in western Afghanistan (search), the government said Sunday.

At least another 40 people were injured in the blast near Shindand, 360 miles west of the capital, Kabul (search), in Herat province, President Hamid Karzai's office said in a statement.

Karzai was "deeply saddened by the news of the terrible accident caused by a fuel explosion" and extended his condolences to the families of the victims, the statement said.

It didn't say when the blast occurred